use jv16 power tools to scrape your registry clean of useless stuff. been using it for a few years (it was called regclean once) and its always been great. it also allows you to backup stuff your remove from the registry in case something doesn't work right after a clean. i've never needed to revert before so i think this program is great. dowload it on the page below and give it a try:

http://www.nonags.com/nonags/pwrt32.html